Title: FreeBSD AIO Library Cross Process Memory Write Vulnerability
Severity: HIGH
Description:
aio.h is a library implementing the POSIX standard for asynchronous I/O. Support for AIO may be enabled in FreeBSD by compiling the kernel with the VFS_AIO option. This option is not enabled in the default kernel configuration.
Under some circumstances, pending reads from an input socket may persist through a call to execve. Eventually the read will continue, and write to the memory space of the new process.
A malicious local user may take advantage of this vulnerability. A program may be constructed to set up asynchronous I/O calls, and then call execve on a suid binary. Once the suid process is started, data read from the initial AIO calls may write to arbitrary locations within the memory space of the suid process. This could immediately lead to the execution of arbitrary code as the root user.
Affected Products:
- FreeBSD FreeBSD 4.4.0
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